US4695168A - Electronic watch having two motors and comprising means for perpetually indicating the day of the month - Google Patents

Electronic watch having two motors and comprising means for perpetually indicating the day of the month Download PDF

Info

Publication number
US4695168A
US4695168A US06/943,013 US94301386A US4695168A US 4695168 A US4695168 A US 4695168A US 94301386 A US94301386 A US 94301386A US 4695168 A US4695168 A US 4695168A
Authority
US
United States
Prior art keywords
signal
day
month
circuit
calendar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/943,013
Other languages
English (en)
Inventor
Pierre-Andre Meister
Pierre Schmidli
Bertrand Soltermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
Eta SA Fabriques dEbauches
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eta SA Fabriques dEbauches filed Critical Eta SA Fabriques dEbauches
Assigned to ETA SA FABRIQUES D'EBAUCHES reassignment ETA SA FABRIQUES D'EBAUCHES ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MEISTER, PIERRE-ANDRE, SCHMIDLI, PIERRE, SOLTERMANN, BERTRAND
Application granted granted Critical
Publication of US4695168A publication Critical patent/US4695168A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G04C3/146—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor incorporating two or more stepping motors or rotors
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C17/00—Indicating the time optically by electric means
    • G04C17/005—Indicating the time optically by electric means by discs
    • G04C17/0058—Indicating the time optically by electric means by discs with date indication
    • G04C17/0066—Indicating the time optically by electric means by discs with date indication electromagnetically driven, e.g. intermittently
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
    • G04G19/10—Arrangements for supplying back-up power

Definitions

  • This invention relates to an analogue electronic watch having two motors, one for driving the time display, the other for driving means for numerically displaying the day of the month, and is more particularly concerned with a watch comprising, in addition, a perpetual-calendar circuit.
  • This circuit includes day, month and year counters and issues a date indicating signal to a control circuit which activates the second motor by causing it to move forward by a number of steps whereby the numerical display of the day of the month may correspond to the contents of the day counter, and thus agree with the date shown by a perpetual calendar.
  • Such watches are known and a form of embodiment thereof is described in U.S. Pat. No. 4,300,222.
  • the watch described in this specification comprises a perpetual calendar displaying the day of the month and, possibly, the day of the week.
  • the calendar is reliable when the watch operates normally, a change of cell causes the counters to be in states that are in no way related to the date since the calendar circuit is no longer able to generate correct signals.
  • the counters, the day of the month display and the time display of the watch need to be corrected. Correcting the day of the month display is done in the usual way. However, correcting the counters is hardly possible for the user or for a watch-repairer not having the required equipment. Indeed, to diminish the time spent, each counter must be corrected separately and this involves complex manipulations. Moreover, for such correction to be possible, the contents of the counters must be known and this information is not displayed by the watch.
  • a change of cell can therefore only be performed in the factory or in an after-sales service centre and this places an undesirable constraint in the use of an otherwise most practical watch.
  • An object of the invention is to overcome this drawback by providing a watch having a perpetual calendar that only involves, after a change of cell, an easy correction of the day of the month display by the bearer of the watch.
  • the watch provided by the invention comprises:
  • a time-keeping circuit able to generate a time base signal
  • a control mechanism including a first gear-train arranged to be driven by said first motor, a contact activatable daily by said first gear-train as the watch switches from one day to the next to generate a daily signal, and a correction member;
  • an analogue time display means arranged to be driven by said first gear-train and alterable by said correction member
  • a perpetual-calendar circuit including day, month and year counters connected in series, and a correction circuit, linked to the month and year counters, for setting to 1 the contents of the day counter at the end of each short month, said calendar circuit being also arranged to generate, in response to the dialy signal applied to the input of the day counter, a calendar signal, representative of the contents of the counters, showing the date and taking into account, by virtue of the correction circuit, the number of days in each month of the year and the leap years, and a monthly signal as the calendar signal switches from one month to the next;
  • a second gear-train arranged to be driven by the said second motor
  • analogue display means for displaying the day of the month and controlled by said second gear-train
  • control circuit connected to the calendar circuit and arranged to receive, in addition, said daily signal and a retrieval signal having a frequency greater than that of said daily signal, for issuing a control signal to said second motor, said control signal serving to alter the day of the month by one day in response to said daily signal, and by the required number of days at the end of a short month in response to said retrieval signal, whereby the day of the month display will agree with the contents of the day counter on the first day of each month;
  • a first transmission circuit for transferring, as each day, each month and each year moves on to the next, the contents of said day, month and year counters, respectively, to said perpetual memory
  • a replacement cell detection circuit arranged to generate a detection signal when the voltage of said replacement cell is applied across said circuits
  • a second transmission circuit for transferring, in response to said detection signal, the contents of said non-volatile memory to the counters of said calendar circuit.
  • One advantage of the invention is that, after a change of cell, the permanent calendar circuit may be made to perform again correctly by merely correcting the numerical indication of the day of the month that is shown, a simple operation that can be done by the user in the same way as with ordinary calendar watches.
  • FIGS. 1A and 1B together show, in block diagram form, a preferred form of embodiment of the watch provided by the invention.
  • the illustrated watch comprises a time-keeping circuit 1 which supplies a clock signal S1 to a first motor 2 which, via a control mechanism 3, drives a time display 4 having hour, minute and second hands.
  • Time-keeping circuit 1 includes an oscillator 10 whose frequency is stabilized by a quartz resonator 11, generating a signal of e.g. 32768 Hz, a two-input AND gate 12 having one input connected to the output of the oscillator, a frequency divider 13 having a first input connected to the output of AND gate 12, and a drive circuit 14 which receives from a first output of frequency divider 13 a 1 Hz signal and issues signal S1 on its own output.
  • Frequency divider 13 further has a second output which issues a retrieval signal S13 having a frequency of about 10 Hz, and a reset input R connected to the output of an inverter 15 whose input is connected to the second input of AND gate 12.
  • Motor 2 may for instance be a stepping motor that rotates in one direction only. It drives, in control mechanism 3, a first gear-train, not shown, which causes the hands of display 4 to move forward. This gear-train also actuates a first, daily contact X, causing it to close it when the watch moves on to the next day, i.e. at midnight, in order to generate a daily logic signal Sx. It will be assumed that signal Sx is low when contact X is open and high when closed. The same applies to signals generated by other contacts described later.
  • Control mechanism 3 further comprises correction means, not shown, for resetting the watch by means of a correction member, e.g. a time-setting crown 16 shown in an inner, neutral position. Crown 16 may be moved to an outer, correction position 16' in which it is mechanically coupled with the hands, enabling the indications of display 4 to be corrected in a conventional manner.
  • a correction member e.g. a time-setting crown 16 shown in an inner, neutral position.
  • Crown 16 may be moved to an outer, correction position 16' in which it is mechanically coupled with the hands, enabling the indications of display 4 to be corrected in a conventional manner.
  • Crown 16 further acts, irrespective of its angular position, on a second, position contact Y that generates a logic signal Sy which is applied to the second input of AND gate 12.
  • Contact Y is closed when crown 16 is in the neutral position, and open when crown 16 is in the correction position.
  • the watch further comprises a perpetual day of the month indicator giving the number of each day of a month.
  • This information is provided by a day of the month display 20 embodied in the usual way by a disc bearing numbers 1 to 31.
  • display 20 is separate from display 4, but in practice the day of the month will appear in an aperture 21 of the time display 4.
  • Display 20 further activates a contact Z on the first day of each month, as by means of a cog 22 provided on the disc opposite number 1.
  • Contact Z generates a first day of the month signal Sz which goes high at the start of the first day of each month and which reverts to low one day later so to remain till the beginning of the next month.
  • Disc 20 is driven forward at the start of each new day by a second unidirectional motor 23 which drives disc 20 via a second gear-train 24, and motor 23 is activated by a control signal S25 generated by a control circuit 25.
  • Circuit 25 comprises a three-input AND gate 26, a two-input OR gate 27 having one input connected to the output of AND gate 26, and a drive circuit 28 connected to the output of gate 27 and which issues on its output control, signal S25.
  • One input of AND gate 26 receives retrieval signal S13, a second receives first day of the month signal Sz, and a third receives a monthly signal Sm, described later.
  • the second input of OR gate 27 receives daily signal Sx.
  • the watch further comprises (FIG. 1B) a perpetual calendar circuit 30 having a five-bit day counter 31 which counts in thirty-ones, a four-bit month counter 32 which counts in twelves, and a two-bit year counter 33 which counts in fours. These counters are connected in series.
  • Counter 31 receives on its input daily signal Sx and issues on one output, at the beginning of each month, monthly signal Sm to counter 32 which, in turn, issues at the beginning of each year an annual signal Sa to counter 33.
  • Each counter further issues, on another output, a signal indicative of its contents, i.e. S31 for counter 31, S32 for counter 32 and S33 for counter 33.
  • counter 32 issues a signal Smc indicative of a short month
  • counter 33 issues a signal Sab indicative of a leap year in a four-year cycle.
  • Circuit 30 further has a correction circuit 34 which receives signals Smc and Sab. Circuit 34 generates, from signals Smc and Sab, a correction signal S34 for counter 31 to set its contents to 1 when the calendar switches from a short month to the following month. In this way, the contents of counter 31 will always agree with what is shown by a perpetual day of the month indicator.
  • Signals S31, S32 and S33 together make up an eleven bit calendar signal S30 representative of the date in counters 31, 32 and 33.
  • Each of these counters further has an input E for setting them, by means of a logic signal, to a given day, month and year respectively. This date setting can however only be done at the factory.
  • Circuit 30 will not be described in detail since such circuits are known and a form of embodiment is described in the US patent specification referred to earlier.
  • Monthly signal Sm is applied to the third input of AND gate 26 in control circuit 25, which operates as folows. Assuming disc 20 and calendar circuit 30 have been set to the correct date, daily signal Sx, which reads at midnight the input of drive circuit 28 via OR gate 27, causes disc 20 to move forward by one day. This same signal also increments by one unit day counter 31. If disc 20 and day counter 31 show a day other than the last day of a month, signals Sz and Sm will respectively be high and low. Retrieval signal S13 will in this case be blocked by AND gate 26 through signal Sm. Disc 20, having rotated through one step, will thus remain in this position until contact X is closed again.
  • the latter further enables, in the event of a malfunction of disc 20, synchronizing with the contents of day counter 31 on the first day of each month. This is due to the fact that, whatever indication is provided by disc 20 when the contents of day counter 31 are 1 and monthly signal Sm is high, AND gate 26 will allow the required number of pulses of retrieval signal S13 to transit through it in order to rotate disc 20 to the first day of the month.
  • Drive circuit 28 issues on its output control circuit signal S25 whenever a signal issues on the output of OR gate 27. The duration of this latter signal therefore does not affect control signal S25. Thus, if a pulse of retrieval signal S13 is interrupted and shortened through contact Z being opened, disc 20 will still rotate normally.
  • control signal S25 may contain only one pulse causing motor 23 to rotate one step. However, to reduce the torque that needs to be supplied by the motor and lower its consumption, it is preferred for disc 20 to be rotated by driving motor 23 through N steps in response to a control signal S25 made up of a series of N consecutive pulses. The triggering of one pulse of a series automatically generates the other pulses in the series, such that disc 20 can only move through whole days.
  • Control circuit 25 can also be designed to generate the control signal S25, that causes disc 20 to advance by the required number of days at the end of a short month, on the basis of the information supplied by signals Smc and Sab, instead of that supplied by signal Sz.
  • An embodiment of such a circuit is described, for example, in the US patent specification mentioned earlier. Contact Z then serves no purpose. This arrangement however has the drawback of not enabling disc 20 in the case of a malfunction of the latter to be synchronized with the contents of counter 31 on the first day of each month.
  • the circuits of the described watch are supplied with energy by a cell not shown. After initially time and date setting the watch the latter will carry on showing the correct time so long as the voltage of the cell remains above a critical threshold.
  • the watch further comprises a first transmission circuit 40, a reprogrammable non-volatile memory 41 also referred to as EEPROM, a second transmission circuit 42 and a voltage detection circuit 43.
  • Transmission circuits 40 and 42 can, for instance, be made up of transmission gates which are known electronic components, while the non-volatile memory, with its interface circuits that enable items of information to be entered and read, can with advantage be of the FAMOS type, also known.
  • the use of such a memory in the watchmaking art is known for instance in Swiss patent specification No. 534913 which describes a frequency correction logic circuit wherein the contents of the non-volatile memory governs the operation of a watch.
  • First transmission circuit 40 enables the contents of the counters of calendar circuit 30 to be transferred to non-volatile memory 41 in response to a transfer signal.
  • circuit 40 comprises a first series 44 of five transmission gates. These gates are connected, firstly, to the output of counter 31 so as to receive the five-bit signal S31 and, secondly, to the input of a first, five-bit section 47 of memory 41. These gates are controlled by the transfer signal which in this case is daily signal Sx.
  • Second transmission circuit 42 has the same structure as circuit 40. It thus also has a first series 50 of five transmission gates. These gates are connected, firstly, to the output of section 47 of memory 41 so as not to receive signal S31 and, secondly, to the input E of counter 31.
  • circuit 43 which is a monostable flip-flop of a known type, generates a detection signal S43 that indicates that the voltage across the terminals of the circuits is again at least equal to the critical threshold. This signal is used as the transfer signal for second transmission circuit 42.
  • counter 42 receives on its input E the signal S31 that existed at the time the watch stopped.
  • Circuit 40 further comprises a series 45 of four transmission gates for transferring each month, in response to signal Sm, signal S32 to a section 48 of memory 41. Finally, a series 46 of two transmission gates enables signal S33 to be transferred to a section 49 of memory 41.
  • transmission circuit 42 further comprises a series 51 of four transmission gates, connected here to the output of section 48 and to input E of counter 32, and a series 52 of two transmission gates connected to the output of section 49 of memory 41 and to input E of counter 33, signal S43 acting as transfer signal for all these gates.
  • calendar circuit 30 receives, from non-volatile memory 41, the signal S30 that existed at the instant the watch stopped, thus setting the counters of this circuit in a state corresponding to the date when the watch stopped.
  • the watch described above can usefully further comprise a known time-zoning device involving magnetic positioning.
  • Crown 16 must then be able to move into a second correction position, not shown, in which it can act on part of the first gear-train to move, by an integral number of hours, only the hour hand and to activate contact X.
  • a second correction position not shown, in which it can act on part of the first gear-train to move, by an integral number of hours, only the hour hand and to activate contact X.
  • disc 20 moves forward by one whole day and counter 31 is incremented by one unit.
  • In the second correction position of crown 16 contact Y remains closed to enable the watch to carry on working normally.
  • Second motor 23 should be able to rotate in both directions, i.e. be bidirectional.
  • Control mechanism 3 must then have means, e.g. contacts, for ascertaining, by means of a discrimination circuit not shown but known, the direction of rotation of crown 16 when it is in a correction position.
  • the discrimination circuit generates a logic signal which is applied to an input not shown of circuit 28, and to an input not shown of counters 31, 32 and 33.
  • One logic level of this signal will correspond to forward rotation of the motor, causing disc 20 to advance, and to incremation of the counters, whereas the other logic level will correspond to backward rotation of the motor and decrementation of the counters.
  • the day of the month displayed by disc 20 will, under the above conditions, always agree with the contents of counter 31, whatever the direction of rotation of the hour hand at the time contact X is activated, in response to rotation of crown 16 while in a correction position.
  • the time-zoning device besides the function for which it is designed, further enables, in conjunction with bidirectinal motor 23, the day of the month displayed by disc 20 to be easily and rapidly modified after a change of cell.
  • the watch could also be time set electronically by signals generated by a time setting circuit, not shown but known, that activates first motor 2 in response to a rotation of crown 16.
  • motor 2 should also be bidirectional.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
US06/943,013 1985-12-18 1986-12-18 Electronic watch having two motors and comprising means for perpetually indicating the day of the month Expired - Lifetime US4695168A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH05437/85 1985-12-18
CH543785A CH661833GA3 (en, 2012) 1985-12-18 1985-12-18

Publications (1)

Publication Number Publication Date
US4695168A true US4695168A (en) 1987-09-22

Family

ID=4293578

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/943,013 Expired - Lifetime US4695168A (en) 1985-12-18 1986-12-18 Electronic watch having two motors and comprising means for perpetually indicating the day of the month

Country Status (7)

Country Link
US (1) US4695168A (en, 2012)
EP (1) EP0231451B1 (en, 2012)
JP (1) JPH07119811B2 (en, 2012)
CH (1) CH661833GA3 (en, 2012)
DE (1) DE3668507D1 (en, 2012)
HK (1) HK32393A (en, 2012)
SG (1) SG126792G (en, 2012)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733384A (en) * 1986-05-26 1988-03-22 Eta S.A. Fabriques D'ebauches Perpetual calendar watch having two motors
US4775963A (en) * 1986-10-15 1988-10-04 ETA SA Fabriques d'Ebauches of Granges Analog watch having two motors and comprising means for perpetually indicating the day of the month
DE3890910T1 (de) * 1987-11-11 1989-12-21 Rolex Montres Verfahren fuer die programmierung des ewigen kalenders einer uhr und uhr fuer die anwendung dieses verfahrens
US4956826A (en) * 1989-03-17 1990-09-11 Master Free Time, Inc. Multi-year time clock having automatic daylight saving time compensator
US5239522A (en) * 1991-02-05 1993-08-24 Complications Sa Method for the setting of the perpetual calendar of an analogic quartz chronograph as well as a quartz chronograph for carrying it out
US5357492A (en) * 1992-07-02 1994-10-18 Sony Corporation Apparatus for indicating times and/or date in portable recording unit
DE3890910C2 (de) * 1987-11-11 2000-05-18 Rolex Montres Verfahren für die Programmierung des ewigen Kalenders einer Uhr und Uhr für die Anwendung dieses Verfahrens
US6185158B1 (en) * 1996-08-30 2001-02-06 Citizen Watch Co., Ltd. Small electronic apparatus having function display
US6240052B1 (en) * 1997-12-26 2001-05-29 Citizen Watch Co., Ltd. Electronic watch with calendar
US6385136B2 (en) 1997-12-26 2002-05-07 Citizen Watch Co., Ltd. Electronic timepiece with calendar month-end non-correction device
US6477114B1 (en) * 1997-12-26 2002-11-05 Citizen Watch Co., Ltd. Electronic timepiece with calendar device
US20040027921A1 (en) * 1998-04-06 2004-02-12 Emerson Radio Corp. Method and apparatus for automatically displaying a correct time and date when initially activating a clock
US20050058157A1 (en) * 2001-09-21 2005-03-17 Quartex, Inc. Wireless synchronous time system
US20050111304A1 (en) * 2001-09-21 2005-05-26 Quartex, Inc. Wireless synchronous time system
US20050162981A1 (en) * 2002-03-08 2005-07-28 Quartex, Inc., A Division Of Primex, Inc. Time keeping system with automatic daylight savings time adjustment
US20060058926A1 (en) * 2001-09-21 2006-03-16 Quartex, A Division Of Primex, Inc. Wireless synchronous time system with solar powered transceiver
US20060158963A1 (en) * 2001-09-21 2006-07-20 Quartex, Inc., A Division Of Primex, Inc. Time keeping system with automatic daylight savings time adjustment
US20150168917A1 (en) * 2013-12-13 2015-06-18 Eta Sa Manufacture Horlogere Suisse Control method for an analogue display fitted to a timepiece movement

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0390888A (ja) * 1989-09-01 1991-04-16 Seiko Instr Inc アナログ電子時計
CH686106B5 (fr) * 1993-03-23 1996-07-15 Ebauchesfabrik Eta Ag Montre-chronographe avec indicateur de quantième.
JP2900154B1 (ja) * 1998-02-12 1999-06-02 セイコーインスツルメンツ株式会社 オートカレンダ付電子時計
CN2346848Y (zh) * 1998-08-31 1999-11-03 张明煌 快速调整式人孔盖座
JP6466224B2 (ja) * 2015-03-31 2019-02-06 シチズン時計株式会社 アナログ電子時計及びアナログ電子時計の制御方法
JP6798573B2 (ja) * 2019-04-10 2020-12-09 カシオ計算機株式会社 アナログ表示装置、電子時計、表示動作制御方法、及びプログラム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4211065A (en) * 1977-08-26 1980-07-08 Hughes Aircraft Company Automatic system for setting digital watches
US4300224A (en) * 1977-10-18 1981-11-10 Kabushiki Kaisha Suwa Seikosha Electronic timepiece
US4456386A (en) * 1980-11-26 1984-06-26 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Timepiece having a divider chain with an adjustable division rate

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6013153B2 (ja) * 1976-12-03 1985-04-05 シチズン時計株式会社 カレンダ−付電子時計
JPS5388761A (en) * 1976-12-27 1978-08-04 Seiko Epson Corp Electronic watch with auxiliary battery
CH613837B (fr) * 1977-06-14 Suisse Horlogerie Montre electronique a affichage mecanique.
JPS5494850A (en) * 1978-01-11 1979-07-26 Nissan Motor Arithmetic processor
GB2015208B (en) * 1978-02-27 1982-09-02 Rockwell International Corp Data monitoring and recording system incorporating a real time clock using computer means
JPS6045834B2 (ja) * 1978-03-30 1985-10-12 セイコーエプソン株式会社 時計用日表示部材の送り機構
GB2063160B (en) * 1979-10-30 1984-01-11 Pitney Bowes Inc Electronic postage meter
DE3247910A1 (de) * 1982-12-24 1984-06-28 SWF-Spezialfabrik für Autozubehör Gustav Rau GmbH, 7120 Bietigheim-Bissingen Schaltanordnung zur datenspeicherung in kraftfahrzeugen
JPS6033680A (ja) * 1983-08-03 1985-02-21 Hitachi Ltd 標準パタ−ン作成方式

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4211065A (en) * 1977-08-26 1980-07-08 Hughes Aircraft Company Automatic system for setting digital watches
US4300224A (en) * 1977-10-18 1981-11-10 Kabushiki Kaisha Suwa Seikosha Electronic timepiece
US4456386A (en) * 1980-11-26 1984-06-26 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Timepiece having a divider chain with an adjustable division rate

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733384A (en) * 1986-05-26 1988-03-22 Eta S.A. Fabriques D'ebauches Perpetual calendar watch having two motors
US4775963A (en) * 1986-10-15 1988-10-04 ETA SA Fabriques d'Ebauches of Granges Analog watch having two motors and comprising means for perpetually indicating the day of the month
DE3890910T1 (de) * 1987-11-11 1989-12-21 Rolex Montres Verfahren fuer die programmierung des ewigen kalenders einer uhr und uhr fuer die anwendung dieses verfahrens
DE3890910C2 (de) * 1987-11-11 2000-05-18 Rolex Montres Verfahren für die Programmierung des ewigen Kalenders einer Uhr und Uhr für die Anwendung dieses Verfahrens
US4956826A (en) * 1989-03-17 1990-09-11 Master Free Time, Inc. Multi-year time clock having automatic daylight saving time compensator
US5239522A (en) * 1991-02-05 1993-08-24 Complications Sa Method for the setting of the perpetual calendar of an analogic quartz chronograph as well as a quartz chronograph for carrying it out
US5357492A (en) * 1992-07-02 1994-10-18 Sony Corporation Apparatus for indicating times and/or date in portable recording unit
US6185158B1 (en) * 1996-08-30 2001-02-06 Citizen Watch Co., Ltd. Small electronic apparatus having function display
US6240052B1 (en) * 1997-12-26 2001-05-29 Citizen Watch Co., Ltd. Electronic watch with calendar
US6385136B2 (en) 1997-12-26 2002-05-07 Citizen Watch Co., Ltd. Electronic timepiece with calendar month-end non-correction device
US6477114B1 (en) * 1997-12-26 2002-11-05 Citizen Watch Co., Ltd. Electronic timepiece with calendar device
DE19882139B3 (de) * 1997-12-26 2013-10-02 Citizen Holdings Co., Ltd. Elektronische Uhr mit einer Vorrichtung zum Einstellen von Kalenderdaten am Monatsende
DE19882138B4 (de) * 1997-12-26 2007-05-16 Citizen Watch Co Ltd Elektronische Uhr mit Kalendervorrichtung
DE19860116B4 (de) * 1997-12-26 2006-10-05 Citizen Watch Co., Ltd., Nishitokyo Elektronische Uhr mit Kalender
US20040027921A1 (en) * 1998-04-06 2004-02-12 Emerson Radio Corp. Method and apparatus for automatically displaying a correct time and date when initially activating a clock
US7359288B2 (en) * 1998-04-06 2008-04-15 Emerson Radio Corp. Method and apparatus for automatically displaying a correct time and date when initially activating a clock
US20060158963A1 (en) * 2001-09-21 2006-07-20 Quartex, Inc., A Division Of Primex, Inc. Time keeping system with automatic daylight savings time adjustment
US20080212413A1 (en) * 2001-09-21 2008-09-04 Pikula Michael A Wireless synchronous time system
US20050058157A1 (en) * 2001-09-21 2005-03-17 Quartex, Inc. Wireless synchronous time system
US20050111304A1 (en) * 2001-09-21 2005-05-26 Quartex, Inc. Wireless synchronous time system
US7369462B2 (en) 2001-09-21 2008-05-06 Quartex, Division Of Primex, Inc. Wireless synchronous time system with solar powered transceiver
US7394726B2 (en) 2001-09-21 2008-07-01 Quartex, Division Of Primex, Inc. Time keeping system with automatic daylight savings time adjustment
US20080159080A1 (en) * 2001-09-21 2008-07-03 Abbott Mark A Wireless synchronous time system with solar powered transceiver
US7411869B2 (en) 2001-09-21 2008-08-12 Quartex, Division Of Primex, Inc. Wireless synchronous time system
US20080198698A1 (en) * 2001-09-21 2008-08-21 Pikula Michael A Wireless synchronous time system
US20060058926A1 (en) * 2001-09-21 2006-03-16 Quartex, A Division Of Primex, Inc. Wireless synchronous time system with solar powered transceiver
US20080212412A1 (en) * 2001-09-21 2008-09-04 Pikula Michael A Wireless synchronous time system
US7457200B2 (en) 2001-09-21 2008-11-25 Quartex, Division Of Primex, Inc. Wireless synchronous time system
US20080316870A1 (en) * 2001-09-21 2008-12-25 Pikula Michael A Wireless synchronous time system
US7480210B2 (en) 2001-09-21 2009-01-20 Quartex, Division Of Primex, Inc. Wireless synchronous time system
US7499379B2 (en) 2001-09-21 2009-03-03 Quartex, Division Of Primax, Inc. Wireless synchronous time system
US7539085B2 (en) 2001-09-21 2009-05-26 Quartex, Division Of Primex, Inc. Wireless synchronous time system
US20050162981A1 (en) * 2002-03-08 2005-07-28 Quartex, Inc., A Division Of Primex, Inc. Time keeping system with automatic daylight savings time adjustment
US20150168917A1 (en) * 2013-12-13 2015-06-18 Eta Sa Manufacture Horlogere Suisse Control method for an analogue display fitted to a timepiece movement
US9389589B2 (en) * 2013-12-13 2016-07-12 Eta Sa Manufacture Horlogere Suisse Control method for an analogue display fitted to a timepiece movement

Also Published As

Publication number Publication date
DE3668507D1 (de) 1990-03-01
SG126792G (en) 1993-03-12
EP0231451B1 (fr) 1990-01-24
HK32393A (en) 1993-04-08
JPH07119811B2 (ja) 1995-12-20
CH661833GA3 (en, 2012) 1987-08-31
EP0231451A1 (fr) 1987-08-12
JPS62147392A (ja) 1987-07-01

Similar Documents

Publication Publication Date Title
US4695168A (en) Electronic watch having two motors and comprising means for perpetually indicating the day of the month
US4316272A (en) Electronic timepiece with global time zone display
US4303995A (en) Electronic timepiece with calendar display arrangement
JP4290770B2 (ja) 電気アナログ時計
US4232510A (en) Timepiece
US4262345A (en) Electronic clock having an analog display and a plurality of digital functions
US4775963A (en) Analog watch having two motors and comprising means for perpetually indicating the day of the month
EP1830233B1 (en) Electronic timepiece with calendar function and control method for same
JPH0347718B2 (en, 2012)
US7120091B1 (en) Electronic device with calendar function
JP2007010669A (ja) 時計のアナログ表示手段と時間カウンタ間の同期化方法
US4282592A (en) Indicating member advancing mechanism
US4261046A (en) Timepiece
US4733384A (en) Perpetual calendar watch having two motors
US6046964A (en) Electronic timepiece provided with a calendar
JP2808535B2 (ja) アナログ時間表示付万年暦時計
US4254490A (en) Electronic clock having synchronized analog and digital displays
JP6495999B2 (ja) カレンダ表示機構を備えた時計
JPS6030914B2 (ja) 電子時計
JP2008502884A (ja) 時計、特に電波時計で電池交換の後に日付表示を設定する方法および装置
EP0347250B1 (en) Electronic alarm watch
JPS6133149B2 (en, 2012)
JPH0436474Y2 (en, 2012)
JP2500722B2 (ja) 電気光学的表示装置を有する指針式時計
JPS60173491A (ja) 月末無修正機構付電子時計

Legal Events

Date Code Title Description
AS Assignment

Owner name: ETA SA FABRIQUES D'EBAUCHES, SCHILD-RUST-STRASSE 1

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MEISTER, PIERRE-ANDRE;SCHMIDLI, PIERRE;SOLTERMANN, BERTRAND;REEL/FRAME:004650/0380

Effective date: 19861029

Owner name: ETA SA FABRIQUES D'EBAUCHES, SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MEISTER, PIERRE-ANDRE;SCHMIDLI, PIERRE;SOLTERMANN, BERTRAND;REEL/FRAME:004650/0380

Effective date: 19861029

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12